Resin filling method and resin filling device for magnet embedded core

Abstract

A resin filling method for a magnet embedded core includes: a fixing step of sandwiching the laminated iron core at axial ends thereof between a first mold and a second mold provided to face each other; and a resin injecting step of injecting a resin into the magnet insertion hole from a resin injecting portion provided in the first mold or the second mold, wherein in the resin injecting step, an end portion of the resin injecting portion is inserted into the magnet insertion hole beyond an axial end surface of the permanent magnet inserted in the magnet insertion hole.

The invention claimed is: 
     
       1. A resin filling method for a magnet embedded core, for embedding a permanent magnet inserted in a magnet insertion hole provided in a laminated iron core for a motor core with a resin, the method comprising:
 a fixing step of sandwiching the laminated iron core at axial ends thereof between a first mold and a second mold disposed to face each other; and 
 a resin injecting step of injecting the resin into the magnet insertion hole from a resin injecting portion of the first mold or the second mold, 
 wherein in the resin injecting step, an end portion of the resin injecting portion protrudes from a surface of the first or second mold in contact with the laminated iron core and into the magnet insertion hole beyond an end surface of the permanent magnet inserted in the magnet insertion hole. 
 
     
     
       2. The resin filling method for a magnet embedded core according to  claim 1 , wherein the end portion of the resin injecting portion abuts against a side surface of the permanent magnet in the resin injecting step. 
     
     
       3. The resin filling method for a magnet embedded core according to  claim 1 , wherein the magnet insertion hole includes a magnet accommodating portion formed to conform to an outer shape of the permanent magnet as seen in plan view and an expanded portion in communication with the magnet accommodating portion, and in the resin injecting step, at least a part of the end portion of the resin injecting portion is inserted into the expanded portion. 
     
     
       4. The resin filling method for a magnet embedded core according to  claim 1 , wherein in the resin injecting step, the end surface of the permanent magnet adjacent to the resin injecting portion is positioned on a same plane as an axial end surface of the laminated iron core around the magnet insertion hole. 
     
     
       5. A resin filling device for a magnet embedded core, for embedding a permanent magnet inserted in a magnet insertion hole provided in a laminated iron core for a motor core with a resin, the device comprising:
 a first mold and a second mold provided so as to face each other to sandwich axial ends of the laminated iron core therebetween and thereby fix the laminated iron core; and 
 a resin injecting portion of the first mold or the second mold for injecting the resin into the magnet insertion hole, 
 wherein the resin injecting portion includes an end portion configured to protrude from a surface of the first or second mold in contact with the laminated iron core and into the magnet insertion hole beyond an end surface of the permanent magnet inserted in the magnet insertion hole. 
 
     
     
       6. The resin filling method for a magnet embedded core according to  claim 2 , wherein the magnet insertion hole includes a magnet accommodating portion formed to conform to an outer shape of the permanent magnet as seen in plan view and an expansion portion in communication with the magnet accommodating portion, and in the resin injecting step, at least a part of the distal end portion of the resin injecting portion is inserted into the expansion portion. 
     
     
       7. The resin filling method for a magnet embedded core according to  claim 2 , wherein in the resin injecting step, the end surface of the permanent magnet adjacent to the resin injecting portion is positioned on a same plane as an axial end surface of the laminated iron core around the magnet insertion hole. 
     
     
       8. The resin filling method for a magnet embedded core according to  claim 3 , wherein in the resin injecting step, the end surface of the permanent magnet adjacent to the resin injecting portion is positioned on a same plane as an axial end surface of the laminated iron core around the magnet insertion hole. 
     
     
       9. The resin filling method for a magnet embedded core according to  claim 6 , wherein in the resin injecting step, the end surface of the permanent magnet adjacent to the resin injecting portion is positioned on a same plane as an axial end surface of the laminated iron core around the magnet insertion hole.